diff --git a/lib/settings.lua b/lib/settings.lua
index d2e2457..e332d51 100644
--- a/lib/settings.lua
+++ b/lib/settings.lua
@@ -42,7 +42,7 @@ cmd:option("-epoch", 30, 'number of epochs to run')
 cmd:option("-thread", -1, 'number of CPU threads')
 cmd:option("-jpeg_chroma_subsampling_rate", 0.0, 'the rate of YUV 4:2:0/YUV 4:4:4 in denoising training (0.0-1.0)')
 cmd:option("-validation_rate", 0.05, 'validation-set rate (number_of_training_images * validation_rate > 1)')
-cmd:option("-validation_crops", 80, 'number of cropping region per image in validation')
+cmd:option("-validation_crops", 160, 'number of cropping region per image in validation')
 cmd:option("-active_cropping_rate", 0.5, 'active cropping rate')
 cmd:option("-active_cropping_tries", 10, 'active cropping tries')
 cmd:option("-nr_rate", 0.75, 'trade-off between reducing noise and erasing details (0.0-1.0)')